Copper Removal Cost effective treatment of distillery effluent to remove copper Presented by Dr Stephen Walker
Copper Removal
Cost effective treatment of distillery effluent to remove copper
Presented by Dr Stephen Walker
Copper Reduction Tests
reduction in Copper above 90%
Copper Reduction
Average start figure
4.00mg/l
After treatment
0.58mg/l
Percentage
reduction
85%
Relationship between pH increase and Copper Reduction
pH at Start Copper at Start pH at end Copper at end
9.0 12.0mg/l 8.3 2.6mg/l
9.5 12.0mg/l 8.7 2.9mg/l
10.0 12.2mg/l 9.1 3.0mg/l
10.5 12.2mg/l 9.6 3.5mg/l
11.0 12.2mg/l 10.2 4.7mg/l
11.5 12.1mg/l 10.6 6.7mg/l
12.0 12.1mg/l 11.1 7.6mg/l
0
2
4
6
8
10
12
14
0 1 2 3 4 5 6 7 8
pH at StartCopper at Start (mg/l)pH at endCopper at end (mg/l)
pH
Mg/l of Copper
Relationship between pH increase and Copper Reduction
Affect on Copper using Chemical/Physical Treatment System
Copper Before Copper After Percentage (%)
Treatment Treatment Reduction
pH Adjusted to 8.3
12.0mg/l 2.6mg/l 79%
11.5mg/l 2.8mg/l 75%
18.0mg/l 4.0mg/l 78%
11.8mg/l 2.8mg/l 76%
12.2mg/l 3.0mg/l 75%
Average Percentage (%) Reduction in Total Copper = 76.6%
Affect on Chemical Oxygen Demand (COD) using Chemical /
Physical Treatment Process
Pre DAF COD Post DAF COD Percentage (%)
Reduction
6,440mg/l 4,166mg/l 35%
4,885mg/l 3,504mg/l 28%
5,240mg/l 3,855mg/l 28%
4,020mg/l 2,811mg/l 28%
5,700mg/l 4,072mg/l 30%
Average Percentage (%) reduction in COD = 30%
Effect on Suspended Solids (SS) Using Chemical/Physical
Treatment Process
Before Treatment Post Treatment Percentage (%)
Reduction
2210mg/l 880mg/l 70%
1350mg/l 460mg/l 66%
1350mg/l 440mg/l 67%
550mg/l 180mg/l 67%
1520mg/l 460mg/l 70%
Average Percentage (%) Reduction in Suspended Solids (SS) = 67%
Adjusting pH using Hydrochloric Acid to improve Copper removal
Initial pH Initial Copper Adjusted pH Final Copper
12.0 12.2mg/l 8.3 3.0mg/l
11.5 12.1mg/l 8.5 2.8mg/l
11.0 11.7mg/l 8.5 2.6mg/l
10.5 11.7mg/l 8.3 2.4mg/l
10.0 10.6mg/l 8.9 4.2mg/l
Note at pH 10 no additional acid used for this test
9.5 7.6mg/l 8.6 3.1mg/l
As at pH 10 no need to adjust with acid, chemical programme adequate
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